Message-ID: <49EDFFE6.1080401@goop.org>
Date: Tue, 21 Apr 2009 10:18:30 -0700
From: Jeremy Fitzhardinge <jeremy@goop.org>
User-Agent: Thunderbird 2.0.0.21 (X11/20090320)
MIME-Version: 1.0
To: Mathieu Desnoyers <compudj@krystal.dyndns.org>
CC: Andi Kleen <andi@firstfloor.org>, Steven Rostedt <rostedt@goodmis.org>,
       linux-kernel@vger.kernel.org, Ingo Molnar <mingo@elte.hu>,
       Andrew Morton <akpm@linux-foundation.org>,
       Thomas Gleixner <tglx@linutronix.de>,
       Peter Zijlstra <peterz@infradead.org>,
       Frederic Weisbecker <fweisbec@gmail.com>, Theodore Tso <tytso@mit.edu>,
       Arjan van de Ven <arjan@infradead.org>, Christoph Hellwig <hch@lst.de>,
       Lai Jiangshan <laijs@cn.fujitsu.com>, Zhaolei <zhaolei@cn.fujitsu.com>,
       Li Zefan <lizf@cn.fujitsu.com>,
       KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
       Masami Hiramatsu <mhiramat@redhat.com>,
       "Frank Ch. Eigler" <fche@elastic.org>, Tom Zanussi <tzanussi@gmail.com>,
       Jiaying Zhang <jiayingz@google.com>, Michael Rubin <mrubin@google.com>,
       Martin Bligh <mbligh@google.com>,
       Peter Zijlstra <a.p.zijlstra@chello.nl>,
       Neil Horman <nhorman@tuxdriver.com>,
       Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro>,
       Pekka@firstfloor.org
Subject: Re: [PATCH 2/8] tracing: create automated trace defines
References: <20090414172337.280621613@goodmis.org> <20090414172640.796858018@goodmis.org> <49E51FC1.8090306@goop.org> <20090415014548.GA7984@Krystal> <49E6065B.7080409@goop.org> <20090416023456.GC22378@Krystal> <49E69E76.9030608@goop.org> <20090416234410.GA20513@Krystal> <87zlebpzmk.fsf@basil.nowhere.org> <20090421155106.GE3792@Krystal>
In-Reply-To: <20090421155106.GE3792@Krystal>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 870
Lines: 27

Mathieu Desnoyers wrote:
> * Andi Kleen (andi@firstfloor.org) wrote:
>   
>> Mathieu Desnoyers <compudj@krystal.dyndns.org> writes:
>>
>>     
>>> Given how slow function calls are, at least on x86,
>>>       
>> That was with frame pointers right? Frame pointers tend to make
>> function calls slow.
>>
>>     
>
> Looking at my .config, CONFIG_FRAME_POINTER is disabled here. So we
> should probably expect an even worse performance impact if we enable
> them.

I tried disabling frame pointers, but it looked to me like tracing 
selects them.  Did I misread, or perhaps it was some other config option 
doing it...

    J
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/